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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 11,775,000 |  |
Capitalization of stock based compensation expense | $ 0.0 |  |
Proceeds from stock options exercised | 4.4 | $ 4.2 | $ 6.8
Share-based compensation expense, shares that vests on grant date | $ 6.5 | $ 10.1 | 8.8
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 4,962,885 | 4,417,693 |
Exercise period | 10 years | 7 years |
Award vesting period | 3 years |  |
Proceeds from stock options exercised | $ 4.4 | $ 4.2 | 6.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | 1.6 | 1.0 | 4.1
Fair value of options vested during the period | 2.7 | 1.9 | 2.3
Unrecognized compensation expense | $ 3.3 |  |
Weighted average years expense to be recognized over | 1 year 8 months 12 days |  |
Share-based compensation expense, shares that vests on grant date | $ 2.7 | 2.7 | 2.0
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Unrecognized compensation expense | $ 5.7 |  |
Weighted average years expense to be recognized over | 1 year 9 months 18 days |  |
Share-based compensation expense, shares that vests on grant date | $ 5.2 | $ 5.1 | $ 4.7
Shares outstanding | 2,050,085 | 1,716,445 |
Weighted average grant date fair value | $ 7.92 | $ 8.74 | $ 12.71
Fair value of stock awards vested | $ 4.7 | $ 3.6 | $ 4.7
PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | 0.0 |  |
Share-based compensation expense, shares that vests on grant date | $ (1.4) | $ 2.3 | $ 2.1
Shares outstanding | 0 | 1,021,543 |
Weighted average grant date fair value | $ 8.25 | $ 8.35 | $ 12.82
Fair value of stock awards vested | $ 4.8 | $ 8.1 | $ 10.0
Share-based Compensation, Equity Instruments Other than Options, Shares Called upon Vested | 1 |  |
Minimum | PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage awarded | 0.00% |  |
Maximum | PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Percentage awarded | 200.00% |  |
Fully Vested On The Grant Date | RSUs | Non-employee directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense, shares that vests on grant date | $ 0.9 | $ 1.1 | $ 1.1

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